LEE ENFIELD WINCHESTER BROWNING ???? MILITARY STENSILS | eBay

That's a link to an e-*** item which would be the real deal. I've seen these letter sets on issue to SQMS stores and the replacement brass letters are still demandable through the system.
The stencil cutting machine that Peter described is also still used, but it's usually used for making throw away stencils from sheets of card.
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